This is an old-school kind of glitch, one that will give you unlimited lives. To perform this, find the planet that has three koopas on it in the Supermassive Galaxy. Kill two and leave one alive. You will keep bouncing on his back and earning lives until you hit 99.

The world's favorite plumber/astronaut(?) returns in Super Mario Galaxy 2 with a Luigi-shaped ship and a couple new suits, including an extremely cool rock suit. Stop reading and just watch the trailer.

This trailer shows off not only a new character for this installment of Super Mario Galaxy, but new gameplay for that character. You now have the ability to have Yoshis tongue target several enemies and slurp them up, one-by-one.